How Long Can Yogurt Sit Out? - Tasting Table
Briefly

Packing lunch is an essential routine, especially when including perishables like yogurt. The U.S. Department of Agriculture states yogurt can remain safe to eat for up to two hours at room temperature; this decreases to one hour in temperatures above 90°F. To avoid spoilage, it’s wise to pack cold sources and utilize insulated containers. Signs of yogurt spoilage include mold growth, and it's advisable to discard any yogurt showing these signs to avoid health risks.
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